Fix a memory leak in virCgroupGetPercpuStats

Coverity reports that my commit af1c98e4 introduced
two memory leaks:
the cpumap if ncpus == 0 in virCgroupGetPercpuStats
and the params array in the test of the function.

src/util/vircgroup.c

@@ -3061,8 +3061,10 @@ virCgroupGetPercpuStats(virCgroupPtr group,
 
     total_cpus = virBitmapSize(cpumap);
 
-    if (ncpus == 0)
-        return total_cpus;
+    if (ncpus == 0) {
+        rv = total_cpus;
+        goto cleanup;
+    }
 
     if (start_cpu >= total_cpus) {
         virReportError(VIR_ERR_INVALID_ARG,

tests/vircgrouptest.c

@@ -614,6 +614,7 @@ static int testCgroupGetPercpuStats(const void *args ATTRIBUTE_UNUSED)
 
  cleanup:
     virCgroupFree(&cgroup);
+    VIR_FREE(params);
     return ret;
 }